 Seii was overthrown by the lord of Urasoe around 1349–55; the reign of the new king, Satto, marked the emergence of Chūzan as a small but not insignificant player in regional trade and politics.A number of domestic policies and foreign relations begun at this time would continue until the end of the kingdom five hundred years later.Satto established diplomatic and trade relations with a number of states in the region, including the Ayutthaya Kingdom of Thailand and Joseon Dynasty of Korea, and saw the beginnings of Ryukyu's role in a flourishing system of regional trade.